package com.example.campus.interceptor;


import com.example.campus.properties.JwtProperties;
import com.example.campus.utils.JwtUtil;
import com.example.campus.utils.constant.JwtClaimsConstant;
import com.example.campus.utils.context.BaseContext;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //从请求头中获取令牌
        String adminToken = request.getHeader(jwtProperties.getAdminTokenName());

        if (adminToken != null) {
            //校验令牌
            try {
                log.info("管理员jwt校验:{}", adminToken);
                Claims claims = JwtUtil.parseJWT(jwtProperties.getAdminSecretKey(), adminToken);
                Long adminId = Long.valueOf(claims.get(JwtClaimsConstant.ADMIN_ID).toString());
                log.info("当前管理员id:{}", adminId);
                BaseContext.setCurrentId(adminId);
                //通过，放行
                return true;
            } catch (Exception ex) {
                log.info("管理员校验失败");
                //不通过，响应 401 状态码
                response.setStatus(401);
                return false;
            }
        }

        response.setStatus(401);
        return false;
    }
}
